Add new Math AutoCorrect codes to improve accessibility, discoverability and memorability

Math AutoCorrect codes allow users to type mathematical symbols in MS Word by entering text codes which automatically convert to proper math symbols. For example, \pi for the lowercase Greek pi character. These codes provide a predictable, keyboard-based method to create complex mathematical expressions through memorized text patterns rather than having to locate symbols in menus or toolbars.

We proposes the addition of new Math AutoCorrect codes for inclusion in Microsoft 365 applications (Word, PowerPoint, OneNote, etc.). These recommendations from the DAISY Microsoft Word Accessibility project aim to enhance mathematical content creation for all users, particularly those with visual impairments. The proposed codes include:

- New codes for common mathematical symbols currently lacking AutoCorrect shortcuts
- More intuitive alternatives to existing codes (e.g., \union as a more memorable alternative to \cup for the set union symbol)

The issue names no repository files or tests; begin by identifying where this repository records Math AutoCorrect codes and how the proposed additions are represented. Done means an agreed, complete set of new or alternative codes is recorded for the targeted Microsoft 365 applications and checked against the stated accessibility goals.

Written by the indexing model from the issue text.